<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>分类参数</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card class="box-card">
      <!-- 警告区域 -->
      <el-alert
        title="注意，只允许为第三级分类设置相关参数！"
        type="warning"
        show-icon
        :closable="false"
      >
      </el-alert>

      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            v-model="selectedCateKeys"
            :options="cateList"
            @change="handleChange"
            :props="cateProps"
          ></el-cascader>
        </el-col>
      </el-row>

      <!-- tab 页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 动态参数的区域 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加参数</el-button
          >
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 扩展列 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环 tag 标签 -->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i, scope.row)"
                >
                  {{ item }}
                </el-tag>
                <!-- 文本框的展示 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 按钮的展示 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"> </el-table-column>
            <el-table-column prop="attr_name" label="参数名称">
            </el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 静态属性的区域 -->
        <el-tab-pane label="静态属性" name="only">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加属性</el-button
          >
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 扩展列 -->
            <el-table-column type="expand"> </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"> </el-table-column>
            <el-table-column prop="attr_name" label="属性名称">
            </el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数的对话框区域 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @closed="addDialogClosed"
    >
      <!-- 添加参数的对话框 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 编辑参数的对话框区域 -->
    <el-dialog
      :title="'编辑' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @closed="editDialogClosed"
    >
      <!-- 编辑参数的对话框 -->
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 所有的商品分类列表
      cateList: [],
      //   级联选择器双向绑定的数组
      selectedCateKeys: [],
      // 级联选择框的配置对象
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      //   被激活的tab页签的名称
      activeName: 'many',
      //   动态参数的数据
      manyTableData: [],
      //   静态属性的数据
      onlyTableData: [],
      //   添加参数对话框的显示与隐藏
      addDialogVisible: false,
      //   添加表单数据
      addForm: {
        attr_name: ''
      },
      //   添加表单验证规则
      addFormRules: {
        attr_name: [{ required: true, message: '请输入参数', trigger: 'blur' }]
      },
      //   编辑表单数据
      editForm: {
        attr_name: ''
      },
      //   编辑表单验证规则
      editFormRules: {
        attr_name: [{ required: true, message: '请输入参数', trigger: 'blur' }]
      },
      //   编辑参数对话框的显示与隐藏
      editDialogVisible: false,
      //   编辑参数的id值
      attrid: 0
      //   控制扩展列文本框的显示与隐藏
      //   inputVisible: false,
      // 文本框输入的内容
      //   inputValue: ''
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取所有的商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error(' 获取商品分类列表失败！')
      }
      //   console.log(res.data)
      this.cateList = res.data
    },
    // 级联选择框发生变化后，会触发这个函数
    handleChange() {
      this.getCateParmasList()
    },
    // tab 页签点击事件的处理函数
    handleTabClick() {
      console.log(this.activeName)
      this.getCateParmasList()
    },
    // 获取分类参数列表方法
    async getCateParmasList() {
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      //   选中的是三级分类
      console.log(this.selectedCateKeys)
      //   console.log(this.cateId)
      //   根据所选的Id和当前所处的面板，获取对应的参数
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        {
          params: { sel: this.activeName }
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('获取分类参数列表失败！')
      }
      res.data.forEach((item) => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        item.inputVisible = false
        item.inputValue = ''
      })
      console.log(res.data)
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 点击按钮，添加参数
    addParams() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          }
        )
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败！')
        }
        this.$message.success('添加参数成功！')
        this.addDialogVisible = false
        this.getCateParmasList()
      })
    },
    //   监听添加对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    // 控制编辑参数对话框的展示,并查询参数
    async showEditDialog(attrid) {
      this.attrid = attrid
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attrid}`,
        {
          params: { attr_sel: this.activeName }
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('查询参数失败！')
      }
      this.editForm.attr_name = res.data.attr_name
      this.editDialogVisible = true
    },
    // 监听编辑对话框的关闭事件
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮，编辑参数，隐藏编辑对话框
    editParams() {
      this.$refs.editFormRef.validate(async (valid) => {
        if (!valid) return
        const {
          data: res
        } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.attrid}`,
          { attr_name: this.editForm.attr_name, attr_sel: this.activeName }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('编辑参数失败！')
        }
        this.$message.success('编辑参数成功！')
        this.editDialogVisible = false
        this.attrid = 0
        this.getCateParmasList()
      })
    },
    // 点击按钮，触发确认弹框，删除参数
    async removeParams(attrid) {
      const confirmResult = await this.$confirm(
        '此操作将永久删除该文件, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch((err) => err)
      //   console.log(confirmResult)
      if (confirmResult !== 'confirm') {
        return this.$message({
          type: 'info',
          message: '已取消删除'
        })
      }
      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${attrid}`
      )
      if (res.meta.status !== 200) {
        return this.$message.error('请求删除失败！')
      }
      this.$message.success('请求删除成功！')
      this.getCateParmasList()
    },
    // 失去焦点，或按下enter键触发的方法
    async handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      //   没有return，则证明输入的内容要做后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      this.saveAttrvals(row)
    },
    // 点击展示扩展列输入框
    showInput(row) {
      row.inputVisible = true
      //   渲染后，自动获得焦点
      this.$nextTick((_) => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除对应的参数可选项
    handleClose(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrvals(row)
    },
    // 保存 attr_vals 的操作到数据库
    async saveAttrvals(row) {
      //   保存数据，并发送到数据库
      const { data: res } = await this.$http.put(
        `categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数项失败！')
      }
      this.$message.success('修改参数项成功！')
    }
  },
  computed: {
    //   如果按钮要被禁用，则返回true，否则返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 被选中三级分类的Id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态计算标题的文本
    titleText() {
      if (this.activeName === 'many') {
        return '动态属性'
      }
      return '静态参数'
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin-top: 15px;
}
.el-tag {
  margin: 5px 10px;
}
.input-new-tag {
  width: 90px;
}
</style>
